Magnetic titania-silica composite–Polypyrrole core–shell spheres and their high sensitivity toward hydrogen peroxide as electrochemical sensor

Macroporous polypyrrole-TiO2 composites with improved photoactivity and electrochemical sensitivity

“…It is found that the spectra of the composites have no obvious difference with that of pure PPy except for the reduced peak intensity and the weakness of the characteristic peaks of TiAOATi vibration (400-600 cm À1 ) [37]. The peak intensity attenuation is resulted from the synergetic interaction between PPy and TiO 2 [15,38]. The interaction may be ascribed to the fact that the bound effect of TiO 2 and PPy is followed by the formation of H-bonding between the proton in NAH and the oxygen atom on TiO 2 surface.…”

“…The bands at 3440 cm À1 and 1637 cm À1 are due to the stretching vibration of AOH group and the bending mode of HAOAH. NAH and CAH stretching vibrations of PPy polymer are also in the range of 3300-3500 cm À1 [15,35]. The band at 1290 cm À1 is assigned to = CAH band in plane vibration, and both bands at 1550 cm À1 and 1478 cm À1 correspond to the pyrrole ring vibrations [36].…”

“…Lot of studies have reported the synthesis of organic-inorganic hybrid materials composed of metal oxide/metal and conducting polymers with a typical core-shell structure [8][9][10][11][12][13][14][15]. Both polypyrrole and TiO 2 have been widely studied due to their promising photoelectric and photocatalytic properties [16][17][18][19][20].…”

Analysis of Styrene Polymerization Without Surfactant and N2 Gas in Cylindrical Flask.

“…These nuclei induce the aggregation of smaller particles that retain the spherical shape. Silica spheres are extensively applied in the chemical template of functional devices involving tri-dimensional photonic crystals [24][25][26] , solar cells 27 and sensors 28,29 . Spherical polymeric particles have been applied in nanotechnology because of their easy preparation and formation of self-structured arrangements with good definition at micrometric scale.…”

Notable photocatalytic activity of TiO2-polyethylene nanocomposites for visible light degradation of organic pollutants

“…Some studies report that when an oxygen vacancy was introduced in TiO 2 , mid-gap electronic states derived from hybridization of the O 2p orbital with the Ti 3d orbital were created, and the optical transition between mid-gap states and the conduction band tail would produce charge transfer from the O 2p orbital to the Ti 3d orbital, resulting in a reduced band gap of TiO 2 with oxygen vacancy [12,13]. Polymer-semiconductor composites have received growing attention for their applications in photocatalysts, sensor materials and photoelectric devices [14,15]. The interpenetration of inorganic and organic phases at nanoscale level is suggested to improve the individual properties in a global synergetic effect [16].…”